It would take about a googolplex - it doesn't make much difference, in this case, whether you are talking about googolplex of nanoseconds, seconds, or millennia. Nor does it make much difference whether you count a million numbers every second, or take a year for each number. In any case, it would be much, much more than the current age of the Universe.
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If you counted 1 number every second without ever stopping, it would take you 507,020 years to reach 16 trillion.
That depends on how fast you count. If you can count about 3 numbers every second then it will take about 10 yrs. Of course you really can't count 3 numbers per second for ten years without stopping to sleep and eat so it would take much longer to "really" do it. 32 years if counting properly,sleeping,eating and drinking.
That depends on the speed of counting. At a rate of one number per second, it would take slightly over 11 and a half days.
Naturally, that depends on how fast you can count. But if you can count from 1 to 100 in one minute, and you keep counting every minute, without stopping, for eight hours every day (taking time off to eat, sleep, and go to school), you would reach 1,000,000 in 20 days, 6 hours, and 40 minutes, or almost 3 weeks. If, however, you give up eating, sleeping, and school, and just count every minute of every hour of every day, you would reach 1,000,000 in 6 days, 22 hours, and 40 minutes, almost 1 week.
Speed cannot be expressed as 1.5 seconds! As a result, the question is meaningless.